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After heavy rains this winter, we had to redo some of our roof because we had significant infiltrations into the walls of our kitchen. We waited for the walls to dry to redo the paintings and plaster. However, the moisture spots at the bottom of the walls have grown and now fill almost all of the walls up. Can you tell me if this problem is due to the roof or if there may be another origin?

This is very similar to hair rising. If your home does not have a crawl space, or if the watertightness of the buried walls has not been achieved and no screeds exist, the walls pump the soil moisture.

To remedy this, it will be necessary to drain the tower of your house by installing porous or perforated pipes in a trench that will make the entire tower of the building. Fill your drain with large stones, then pebbles and gravel ending with sand at the cut of capillarity which will have to be, also, installed at the bottom your wall and up to 15 cm above the ground.

In addition, atmospheric siphons can be placed at the base of walls every 50 cm. Sloped drains are introduced. In principle, the dry air entering the drain is responsible for moisture and discharges it to the outside. It is a simple method that often gives good results and allows faster drying of the interior walls.

Once these operations are done you can dry your walls inside, thanks to an electric dehumidifier. Wait until the wall is perfectly dry, scratch the blisters, put a coating and then the coating of your choice.

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